-/*
- * Copyright (C) 1999-2002 Harri Porten (porten@kde.org)
- * Copyright (C) 2001 Peter Kelly (pmk@post.com)
- * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
- * Copyright (C) 2007 Cameron Zwarich (cwzwarich@uwaterloo.ca)
- * Copyright (C) 2007 Maks Orlovich
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public License
- * along with this library; see the file COPYING.LIB. If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- *
- */
-
-#include "config.h"
-#include "Arguments.h"
-
-#include "JSActivation.h"
-#include "JSFunction.h"
-#include "JSGlobalObject.h"
-#include "Operations.h"
-
-using namespace std;
-
-namespace JSC {
-
-const ClassInfo Arguments::s_info = { "Arguments", &Base::s_info, 0, 0, CREATE_METHOD_TABLE(Arguments) };
-
-void Arguments::visitChildren(JSCell* cell, SlotVisitor& visitor)
-{
- Arguments* thisObject = jsCast<Arguments*>(cell);
- ASSERT_GC_OBJECT_INHERITS(thisObject, &s_info);
- COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
- ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
- JSObject::visitChildren(thisObject, visitor);
-
- if (thisObject->m_registerArray)
- visitor.appendValues(thisObject->m_registerArray.get(), thisObject->m_numArguments);
- visitor.append(&thisObject->m_callee);
- visitor.append(&thisObject->m_activation);
-}
-
-void Arguments::destroy(JSCell* cell)
-{
- static_cast<Arguments*>(cell)->Arguments::~Arguments();
-}
-
-void Arguments::copyToArguments(ExecState* exec, CallFrame* callFrame, uint32_t length)
-{
- if (UNLIKELY(m_overrodeLength)) {
- length = min(get(exec, exec->propertyNames().length).toUInt32(exec), length);
- for (unsigned i = 0; i < length; i++)
- callFrame->setArgument(i, get(exec, i));
- return;
- }
- ASSERT(length == this->length(exec));
- for (size_t i = 0; i < length; ++i) {
- if (JSValue value = tryGetArgument(i))
- callFrame->setArgument(i, value);
- else
- callFrame->setArgument(i, get(exec, i));
- }
-}
-
-void Arguments::fillArgList(ExecState* exec, MarkedArgumentBuffer& args)
-{
- if (UNLIKELY(m_overrodeLength)) {
- unsigned length = get(exec, exec->propertyNames().length).toUInt32(exec);
- for (unsigned i = 0; i < length; i++)
- args.append(get(exec, i));
- return;
- }
- uint32_t length = this->length(exec);
- for (size_t i = 0; i < length; ++i) {
- if (JSValue value = tryGetArgument(i))
- args.append(value);
- else
- args.append(get(exec, i));
- }
-}
-
-bool Arguments::getOwnPropertySlotByIndex(JSCell* cell, ExecState* exec, unsigned i, PropertySlot& slot)
-{
- Arguments* thisObject = jsCast<Arguments*>(cell);
- if (JSValue value = thisObject->tryGetArgument(i)) {
- slot.setValue(value);
- return true;
- }
-
- return JSObject::getOwnPropertySlot(thisObject, exec, Identifier(exec, String::number(i)), slot);
-}
-
-void Arguments::createStrictModeCallerIfNecessary(ExecState* exec)
-{
- if (m_overrodeCaller)
- return;
-
- m_overrodeCaller = true;
- PropertyDescriptor descriptor;
- descriptor.setAccessorDescriptor(globalObject()->throwTypeErrorGetterSetter(exec), DontEnum | DontDelete | Accessor);
- methodTable()->defineOwnProperty(this, exec, exec->propertyNames().caller, descriptor, false);
-}
-
-void Arguments::createStrictModeCalleeIfNecessary(ExecState* exec)
-{
- if (m_overrodeCallee)
- return;
-
- m_overrodeCallee = true;
- PropertyDescriptor descriptor;
- descriptor.setAccessorDescriptor(globalObject()->throwTypeErrorGetterSetter(exec), DontEnum | DontDelete | Accessor);
- methodTable()->defineOwnProperty(this, exec, exec->propertyNames().callee, descriptor, false);
-}
-
-bool Arguments::getOwnPropertySlot(JSCell* cell, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
-{
- Arguments* thisObject = jsCast<Arguments*>(cell);
- unsigned i = propertyName.asIndex();
- if (JSValue value = thisObject->tryGetArgument(i)) {
- RELEASE_ASSERT(i < PropertyName::NotAnIndex);
- slot.setValue(value);
- return true;
- }
-
- if (propertyName == exec->propertyNames().length && LIKELY(!thisObject->m_overrodeLength)) {
- slot.setValue(jsNumber(thisObject->m_numArguments));
- return true;
- }
-
- if (propertyName == exec->propertyNames().callee && LIKELY(!thisObject->m_overrodeCallee)) {
- if (!thisObject->m_isStrictMode) {
- slot.setValue(thisObject->m_callee.get());
- return true;
- }
- thisObject->createStrictModeCalleeIfNecessary(exec);
- }
-
- if (propertyName == exec->propertyNames().caller && thisObject->m_isStrictMode)
- thisObject->createStrictModeCallerIfNecessary(exec);
-
- return JSObject::getOwnPropertySlot(thisObject, exec, propertyName, slot);
-}
-
-bool Arguments::getOwnPropertyDescriptor(JSObject* object, ExecState* exec, PropertyName propertyName, PropertyDescriptor& descriptor)
-{
- Arguments* thisObject = jsCast<Arguments*>(object);
- unsigned i = propertyName.asIndex();
- if (JSValue value = thisObject->tryGetArgument(i)) {
- RELEASE_ASSERT(i < PropertyName::NotAnIndex);
- descriptor.setDescriptor(value, None);
- return true;
- }
-
- if (propertyName == exec->propertyNames().length && LIKELY(!thisObject->m_overrodeLength)) {
- descriptor.setDescriptor(jsNumber(thisObject->m_numArguments), DontEnum);
- return true;
- }
-
- if (propertyName == exec->propertyNames().callee && LIKELY(!thisObject->m_overrodeCallee)) {
- if (!thisObject->m_isStrictMode) {
- descriptor.setDescriptor(thisObject->m_callee.get(), DontEnum);
- return true;
- }
- thisObject->createStrictModeCalleeIfNecessary(exec);
- }
-
- if (propertyName == exec->propertyNames().caller && thisObject->m_isStrictMode)
- thisObject->createStrictModeCallerIfNecessary(exec);
-
- return JSObject::getOwnPropertyDescriptor(thisObject, exec, propertyName, descriptor);
-}
-
-void Arguments::getOwnPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
-{
- Arguments* thisObject = jsCast<Arguments*>(object);
- for (unsigned i = 0; i < thisObject->m_numArguments; ++i) {
- if (!thisObject->isArgument(i))
- continue;
- propertyNames.add(Identifier(exec, String::number(i)));
- }
- if (mode == IncludeDontEnumProperties) {
- propertyNames.add(exec->propertyNames().callee);
- propertyNames.add(exec->propertyNames().length);
- }
- JSObject::getOwnPropertyNames(thisObject, exec, propertyNames, mode);
-}
-
-void Arguments::putByIndex(JSCell* cell, ExecState* exec, unsigned i, JSValue value, bool shouldThrow)
-{
- Arguments* thisObject = jsCast<Arguments*>(cell);
- if (thisObject->trySetArgument(exec->vm(), i, value))
- return;
-
- PutPropertySlot slot(shouldThrow);
- JSObject::put(thisObject, exec, Identifier(exec, String::number(i)), value, slot);
-}
-
-void Arguments::put(JSCell* cell, ExecState* exec, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
-{
- Arguments* thisObject = jsCast<Arguments*>(cell);
- unsigned i = propertyName.asIndex();
- if (thisObject->trySetArgument(exec->vm(), i, value))
- return;
-
- if (propertyName == exec->propertyNames().length && !thisObject->m_overrodeLength) {
- thisObject->m_overrodeLength = true;
- thisObject->putDirect(exec->vm(), propertyName, value, DontEnum);
- return;
- }
-
- if (propertyName == exec->propertyNames().callee && !thisObject->m_overrodeCallee) {
- if (!thisObject->m_isStrictMode) {
- thisObject->m_overrodeCallee = true;
- thisObject->putDirect(exec->vm(), propertyName, value, DontEnum);
- return;
- }
- thisObject->createStrictModeCalleeIfNecessary(exec);
- }
-
- if (propertyName == exec->propertyNames().caller && thisObject->m_isStrictMode)
- thisObject->createStrictModeCallerIfNecessary(exec);
-
- JSObject::put(thisObject, exec, propertyName, value, slot);
-}
-
-bool Arguments::deletePropertyByIndex(JSCell* cell, ExecState* exec, unsigned i)
-{
- Arguments* thisObject = jsCast<Arguments*>(cell);
- if (i < thisObject->m_numArguments) {
- if (!Base::deletePropertyByIndex(cell, exec, i))
- return false;
- if (thisObject->tryDeleteArgument(i))
- return true;
- }
- return JSObject::deletePropertyByIndex(thisObject, exec, i);
-}
-
-bool Arguments::deleteProperty(JSCell* cell, ExecState* exec, PropertyName propertyName)
-{
- if (exec->vm().isInDefineOwnProperty())
- return Base::deleteProperty(cell, exec, propertyName);
-
- Arguments* thisObject = jsCast<Arguments*>(cell);
- unsigned i = propertyName.asIndex();
- if (i < thisObject->m_numArguments) {
- RELEASE_ASSERT(i < PropertyName::NotAnIndex);
- if (!Base::deleteProperty(cell, exec, propertyName))
- return false;
- if (thisObject->tryDeleteArgument(i))
- return true;
- }
-
- if (propertyName == exec->propertyNames().length && !thisObject->m_overrodeLength) {
- thisObject->m_overrodeLength = true;
- return true;
- }
-
- if (propertyName == exec->propertyNames().callee && !thisObject->m_overrodeCallee) {
- if (!thisObject->m_isStrictMode) {
- thisObject->m_overrodeCallee = true;
- return true;
- }
- thisObject->createStrictModeCalleeIfNecessary(exec);
- }
-
- if (propertyName == exec->propertyNames().caller && thisObject->m_isStrictMode)
- thisObject->createStrictModeCallerIfNecessary(exec);
-
- return JSObject::deleteProperty(thisObject, exec, propertyName);
-}
-
-bool Arguments::defineOwnProperty(JSObject* object, ExecState* exec, PropertyName propertyName, PropertyDescriptor& descriptor, bool shouldThrow)
-{
- Arguments* thisObject = jsCast<Arguments*>(object);
- unsigned i = propertyName.asIndex();
- if (i < thisObject->m_numArguments) {
- RELEASE_ASSERT(i < PropertyName::NotAnIndex);
- // If the property is not yet present on the object, and is not yet marked as deleted, then add it now.
- PropertySlot slot;
- if (!thisObject->isDeletedArgument(i) && !JSObject::getOwnPropertySlot(thisObject, exec, propertyName, slot)) {
- JSValue value = thisObject->tryGetArgument(i);
- ASSERT(value);
- object->putDirectMayBeIndex(exec, propertyName, value);
- }
- if (!Base::defineOwnProperty(object, exec, propertyName, descriptor, shouldThrow))
- return false;
-
- // From ES 5.1, 10.6 Arguments Object
- // 5. If the value of isMapped is not undefined, then
- if (thisObject->isArgument(i)) {
- // a. If IsAccessorDescriptor(Desc) is true, then
- if (descriptor.isAccessorDescriptor()) {
- // i. Call the [[Delete]] internal method of map passing P, and false as the arguments.
- thisObject->tryDeleteArgument(i);
- } else { // b. Else
- // i. If Desc.[[Value]] is present, then
- // 1. Call the [[Put]] internal method of map passing P, Desc.[[Value]], and Throw as the arguments.
- if (descriptor.value())
- thisObject->trySetArgument(exec->vm(), i, descriptor.value());
- // ii. If Desc.[[Writable]] is present and its value is false, then
- // 1. Call the [[Delete]] internal method of map passing P and false as arguments.
- if (descriptor.writablePresent() && !descriptor.writable())
- thisObject->tryDeleteArgument(i);
- }
- }
- return true;
- }
-
- if (propertyName == exec->propertyNames().length && !thisObject->m_overrodeLength) {
- thisObject->putDirect(exec->vm(), propertyName, jsNumber(thisObject->m_numArguments), DontEnum);
- thisObject->m_overrodeLength = true;
- } else if (propertyName == exec->propertyNames().callee && !thisObject->m_overrodeCallee) {
- thisObject->putDirect(exec->vm(), propertyName, thisObject->m_callee.get(), DontEnum);
- thisObject->m_overrodeCallee = true;
- } else if (propertyName == exec->propertyNames().caller && thisObject->m_isStrictMode)
- thisObject->createStrictModeCallerIfNecessary(exec);
-
- return Base::defineOwnProperty(object, exec, propertyName, descriptor, shouldThrow);
-}
-
-void Arguments::tearOff(CallFrame* callFrame)
-{
- if (isTornOff())
- return;
-
- if (!m_numArguments)
- return;
-
- // Must be called for the same call frame from which it was created.
- ASSERT(bitwise_cast<WriteBarrier<Unknown>*>(callFrame) == m_registers);
-
- m_registerArray = adoptArrayPtr(new WriteBarrier<Unknown>[m_numArguments]);
- m_registers = m_registerArray.get() + CallFrame::offsetFor(m_numArguments + 1);
-
- // If we have a captured argument that logically aliases activation storage,
- // but we optimize away the activation, the argument needs to tear off into
- // our storage. The simplest way to do this is to revert it to Normal status.
- if (m_slowArguments && !m_activation) {
- for (size_t i = 0; i < m_numArguments; ++i) {
- if (m_slowArguments[i].status != SlowArgument::Captured)
- continue;
- m_slowArguments[i].status = SlowArgument::Normal;
- m_slowArguments[i].index = CallFrame::argumentOffset(i);
- }
- }
-
- if (!callFrame->isInlineCallFrame()) {
- for (size_t i = 0; i < m_numArguments; ++i)
- trySetArgument(callFrame->vm(), i, callFrame->argumentAfterCapture(i));
- return;
- }
-
- tearOffForInlineCallFrame(
- callFrame->vm(), callFrame->registers(), callFrame->inlineCallFrame());
-}
-
-void Arguments::didTearOffActivation(ExecState* exec, JSActivation* activation)
-{
- RELEASE_ASSERT(activation);
- if (isTornOff())
- return;
-
- if (!m_numArguments)
- return;
-
- m_activation.set(exec->vm(), this, activation);
- tearOff(exec);
-}
-
-void Arguments::tearOff(CallFrame* callFrame, InlineCallFrame* inlineCallFrame)
-{
- if (isTornOff())
- return;
-
- if (!m_numArguments)
- return;
-
- m_registerArray = adoptArrayPtr(new WriteBarrier<Unknown>[m_numArguments]);
- m_registers = m_registerArray.get() + CallFrame::offsetFor(m_numArguments + 1);
-
- tearOffForInlineCallFrame(
- callFrame->vm(), callFrame->registers() + inlineCallFrame->stackOffset,
- inlineCallFrame);
-}
-
-void Arguments::tearOffForInlineCallFrame(VM& vm, Register* registers, InlineCallFrame* inlineCallFrame)
-{
- for (size_t i = 0; i < m_numArguments; ++i) {
- ValueRecovery& recovery = inlineCallFrame->arguments[i + 1];
- // In the future we'll support displaced recoveries (indicating that the
- // argument was flushed to a different location), but for now we don't do
- // that so this code will fail if that were to happen. On the other hand,
- // it's much less likely that we'll support in-register recoveries since
- // this code does not (easily) have access to registers.
- JSValue value;
- Register* location = ®isters[CallFrame::argumentOffset(i)];
- switch (recovery.technique()) {
- case AlreadyInJSStack:
- value = location->jsValue();
- break;
- case AlreadyInJSStackAsUnboxedInt32:
- value = jsNumber(location->unboxedInt32());
- break;
- case AlreadyInJSStackAsUnboxedCell:
- value = location->unboxedCell();
- break;
- case AlreadyInJSStackAsUnboxedBoolean:
- value = jsBoolean(location->unboxedBoolean());
- break;
- case AlreadyInJSStackAsUnboxedDouble:
-#if USE(JSVALUE64)
- value = jsNumber(*bitwise_cast<double*>(location));
-#else
- value = location->jsValue();
-#endif
- break;
- case Constant:
- value = recovery.constant();
- break;
- default:
- RELEASE_ASSERT_NOT_REACHED();
- break;
- }
- trySetArgument(vm, i, value);
- }
-}
-
-} // namespace JSC
projects / apple / javascriptcore.git / blobdiff